Adjusted AFM - fair bit of difference!

[RRV80]

I adjusted the airflow meter on my hotwire 3.9 after work thisafternoon. I took the plug off, checked it with the ohm meter and to my suprise it read
62Ohms, i i adjusted it back up to 300Ohms where it is supposed to be and for a start it no longer leaves a black circle on the wall from the exhasut, and it seems to run fine, much the same if not a slighlty smoother idle with the a/c on, but one downside is i don't think it has as much acceleration so tommorow im going to have a tinker and maybe bring it back to 150-200Ohms and see if i get some acceleration back. Would be interesting to see if i get better fuel consumption which i dare say i would.

[It'sNotWorthComplaining!]

I adjusted the airflow meter on my hotwire 3.9 after work thisafternoon. I took the plug off, checked it with the ohm meter and to my suprise it read
62Ohms, i i adjusted it back up to 300Ohms where it is supposed to be and for a start it no longer leaves a black circle on the wall from the exhasut, and it seems to run fine, much the same if not a slighlty smoother idle with the a/c on, but one downside is i don't think it has as much acceleration so tommorow im going to have a tinker and maybe bring it back to 150-200Ohms and see if i get some acceleration back. Would be interesting to see if i get better fuel consumption which i dare say i would.

The MAF should be adjusted with the plug on put the multimeter prongs in from behind the cover. As it measure Airflow, you need to have at operating temp
If you did it unconnected then you would only get a static reading.
There is a thread somewhere on Mafs

[BigJon]

From memory you do it engine hot, but not running.

All you are doing is turning a potentiometer. You aren't actually measuring any airflow, just a resistance value.

[RRV80]

yeah i know how it all works i have resoldered circut boards etc in them b4 and adjusted them and yeah i did it engine at O/T not running and it is going great took it for another drive and the exhaust is alot cleaner so it's definatly made a positive difference.

[justinc]

I adjusted the airflow meter on my hotwire 3.9 after work thisafternoon. I took the plug off, checked it with the ohm meter and to my suprise it read
62Ohms, i i adjusted it back up to 300Ohms where it is supposed to be and for a start it no longer leaves a black circle on the wall from the exhasut, and it seems to run fine, much the same if not a slighlty smoother idle with the a/c on, but one downside is i don't think it has as much acceleration so tommorow im going to have a tinker and maybe bring it back to 150-200Ohms and see if i get some acceleration back. Would be interesting to see if i get better fuel consumption which i dare say i would.

with the plug reconnected and back probed, what voltage reading are you getting between earth(Left hand wire) and the far right end wire at idle?

JC

[LOVEMYRANGIE]

You adjust it connected. Hot or cold makes no difference as does running or not running but ignition must be ON.
I do mine running and adjust it to 1.3 - 1.5V.

Adjusting it on a resistance value isnt accurate as its a voltage thing to get it right.

Pull back the cover on the plug with it connected and put test leads into the blue/brown trace (-ve) and red/black trace (+ve).

When running, changing the +ve test lead to a different wire, you can find the signal back to the ECU and by giving it a few revs, will see the voltage fluctuate with the increase in airflow resulting in the cooling effect on the wire. This is a good way to check the meter is working correctly.

Spose everyone wants me to put it on Youtube now to see it being done..... ;)

[RRV80]

well it must be 6 to one half a dozen to the other it is 1.2 volts close enough for me.